cummings



(No Model.)

H. H. CUMMINGS.

PUMP.

No. 483,666. Patented Oct. 4, 1892.

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bwafwu UNITED STATES PATENT OFFICE.

HENRY Il. CUMMINGS, OF'MALDEN, MASSACHUSETTS.

PUMP.

SPECIFICATION forming part of Letters Patent No. 483,666, dated October 4, 1892. Application filed October 14, 1890. Serial No. 368,060- (N o model.)

.T0 all whom it may concern:

Beit known that I, HENRY I-I. CUMM1NGs,of Malden, county of MiddleseigState of Massachusetts, have invented an Improvement in Pumps, of which the following description, in connection with the accompanying drawings, is a specification, like letters and figures on the drawings representing like parts.

In condensing-engines, more particularly marine engines, as at present arranged and constructed it is customary to exhaust the steam from the cylinder into a condenser, wherein a vacuum is maintained by an airpump which draws the water of condensation, together with any air or gases therewith, from the condenser and forces it into a hot-well, from which it is forced as feed-water into the boiler by a separate force or feed pump.

This invention has for its object to construct a pump which shall fulfill the functions both of the air-pump and the force pump referred to and which shall embrace in its construction the hot-well, to thus make a more compact and desirable arrangement especially adapted for small boats, dto.

My invention consists in the combination, with the chamber and two cylinders leading therefrom, an inlet for one and an outlet for the other of said cylinders and valves controlling the same, of a plunger for said cylinders and mechanism to reciprocate the same and co-operating valves on the said plunger, to operate substantially as will be described.

Other features of my invention will be hereinafter pointed out in the claims at the end of this specification.

Figure l shows in side elevation a pump embodying this invention; Fig. 2, a vertical section of the same, taken on the dotted line a' ,Fig.l; Fig. 3, a partial cross-section on the dotted line a," x', Fig. 2; and Fig. 4,`a detail of the pump-plunger.

Referring to the drawings, the base A, of

. suitable shape, has formed within it the two concentric cylinders A A?, located one above the other, the uppermost of the said cylinders being, however, of greater diameter than the lower one, as shown, the said base above the cylinders supporting the preferably-cy` lindrical shell B, forming the hot well or chamber to be referred to, A chamber AEI is formed in the base A, surrounding the cylinder A', which chamber opens into the cylinder A2 above it, the mouth of said chamber being controlled by a circular Hap-valve A4, to be referred to, the said chamber As having an inlet A5. (See Figs. l and 3.) The cylinder A has an outlet A6, in which is placed a check-valve A7.

Plungers l0 and l2, herein shown as formed in a single body or T-shaped plunger, (indicated by the letter (1,) are fitted to slide in the cylinders A A2, as shown. The plunger a has a preferably-central vertical Opening a', controlled at its lower end in the cylinder A by a disk valve a2, to be referred to, and the head or flanged portion of theplunger u, comprising the plunger l2, which moves in the cylinder A2, has a series of vertical openings a3, controlled by the circular flap-valve a4 on the top of the plunger. The plunger or piston rod ax is threaded at its upper end to receive the nuts a5, holding adj ustably between them the yoke b, secured at its ends to the rods h', passing through the lower head of the hot well or chamber B, through suitable stufting-boxes and are jointed to the links b2, in turn jointed at their opposite ends to the forked arm of the lever b3, pivoted at b4 on the'base and connected at b5 to an eccentric-rod 117, moved by an eccentric on the main shaft. (Not shown.)

An auxiliary handle h is provided by which to operate the pump by hand. In practice the inlet A5 is connected with the condenser and the outlet A6 is connected with the boiler, and assuming the plunger a to be at the end of its downward stroke, as shown in the drawings, the operation of the pump is as follows: As the plunger@ is raised the valve at will close and the Valve A4 will open, the rising plunger drawing water of condensation from the condenser through the open valve into the cylinder A2 behind it, and as the plunger reaches the end of its up stroke and begins its return or downward stroke the valve A4 will close and the Water previously drawn into and llin g the cylinder A2 will lift the valve a4 as the plunger descends and pass into the hot well or chamber B, overflowing into the central opening a in the plunger, from whence upon the next upward stroke of the plunger it will pass out through the valve a? into the passage A6, to be forced into the boiler by the succeeding downward stroke.

The pump described performs work to accomplish which ordinarily requires two separate pumps, and my improved apparatus also embodies as part of its construction the hot well or chamber, the apparatus being very desirable, owing to its compactness. The yoke b at its ends is provided with slots bx, (see Fig. 4,) opening in opposite directions, so that to disconnect the yoke from the rods b it is only necessary to slacken the nuts D10, when the yoke may be rotated sufliciently to clear the same, when the yoke-plun ger may be readily removed.

I do not limit this invention to the particular valves nor to the exact construction in general shown, as the same may be varied without departing from the scope of the invention.

l. A pump containing the followingr instrumentalities, viz: two cylinders, each having an open end and a valve-controlled end, a chamber intermediate said cylinders and communicating with their open ends, a piston-rod having an apertured plunger for each cylinder, independent valves to open the apertures in one plunger and close them in the other simultaneously at each stroke of the piston, and means to reciprocate the piston, substantially as described.

2. A pump containing the following instrumentalities, viz: two cylinders, an inlet-valve vat one end exc-one of-said-cylindcrs and an`V outlet-valve at the delivery end of the other of said cylinders, a chamber communicating with and contiguous to the opening of the cylinders opposite the said valves, and a pistonred having plungers for said cylinders and each provided with valves to control the communication between said chamber and cylinders, and means to reciprocate the said piston-rod, to operate substantially as described.

3. In a pump, the combination of the following instrnmentalities, viz: a chamber, a cylinder leading therefrom and in unobstructed communication therewith, a second cylinder leading from and of smaller diameter than the first, a plunger for the said cylinders having a passage intermediate and connecting the said chamber with said second cylinder beyond said plunger and a valve to control said passage, co-operating valves in said cylinders and on said plunger to control the passage of the iiuid from the Iirst to the second cylinder, and means to reciprocate said plunger, to operate substantially as described.

4:. The chamber B, cylinders A A2, leading therefrom, and valves A4 and A?, combined with a plunger a, having a valve d4, a passage a', and valve afsaid valves a4 and d2 controlling the passage of fluid through the plunger, and mechanism to reciprocate the said plunger, substantially as described.

5. The chamber B and cylinders A A2, combined with a plunger a, having openings a3, central opening a', connecting said chamber B and cylinder or', and valves controlling the same, and by which valves and openings communication between cylinder A2, chamber B, and cylinder A is established, substantially as described. Y

6. The combination of the chamber B, cylinders A A2, communicating therewith, the plunger ain said cylinders, its plunger-rod ax, yoke b in the chamber B, and the bars b', the bars b extended beyond said chamber, guides therefor in said chamber, links b2, connected to said bars, and pivoted levers b3, to operate substantially as described.

'7. In a pump, a chamber, two cylinders of different diameters placed substantially in line, inlets-and outlets for the said cylinders,Y

the outlet of one cylinder leading to the said chamber and to the inlet of the other cylinder, and valves controlling the same,combined with a plunger for the said cylinders and means to reciprocate the same, to operate substantially as described.

In testimony whereof I have signed my name to this specilication in the presence of two subscribing witnesses.

HENRY I-I. CUMMINGS.

Witnesses: Y Y Y Y Y Y JAS. H. CHURCHILL, FREDERICK L. EMERY. 

